Sound the giant horn.

Achievement Guide for Call of the Giants

Achievement won on 12 Aug 15TA Score for this game: 1,091
Posted on 12 August 15 at 07:58

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During Chapter 5, after dropping an axe on a giant's arm to clear the path in the water, you'll proceed up a hill and then walk across a log over the river to get to the other side. Instead of going to the left towards the crossbow, jump the gap to the right and interact with the giant horn in order to unlock this achievement.